10
votes
Accepted
Is it possible to increase the heat output of a gas stove by connecting two gas supply canisters to it at the same time, and is it safe to do so?
is it possible to increase the heat output of the burner by
connecting two low-pressure supplies in parallel via a
T-piece like this one?
The primary factor is gas pressure at the tee. If the ...
- 532
9
votes
Is it possible to increase the heat output of a gas stove by connecting two gas supply canisters to it at the same time, and is it safe to do so?
No, connecting two tanks together will not double the flow.
The regulators fitted to tanks limit the pressure and flow rate so all you do is double the amount of gas the burner has available ie ...
- 15.5k
6
votes
Accepted
How do gas flow regulators avoid choking?
The short answer is that they don't. Choking is not a bad thing. For a gas flow regulator, it's actually a good thing, because under choking conditions, the mass-flow rate is no longer dependent on ...
5
votes
Accepted
Is steel air (argon) tight?
Steel is routinely used for high pressure storage of industrial argon. For practical purposes it is certainly 'gas tight' although there may be a certain amount of atomic level diffusion into the ...
- 15.2k
5
votes
Accepted
What material is used to make gas pipes?
In my admittedly limited experience working with plumbers, natural gas pipes are typically made from galvanized steel for interior work, or from black steel pipe for underground. Last-leg fittings and ...
- 4,041
5
votes
Easily compute a good approximation of heat conductivity of cooled semi-vacuum (water vapor + air)
In the molecular flow region of pressure, the thermal conductivity of an ideal, monatomic gas is obtained by this equation.
$$
k = \frac{1}{\pi^{3/2} d^2}\sqrt{k_B^3T/m}
$$
where $d$ is the ...
- 2,878
4
votes
Can mercury escape undectectably from a CFL bulb? or does it have to shatter for the mercury to be liberated?
If there were a crack in the glass, then the pressure difference would first cause air to flow into the lamp, which would cause it to stop working (both the mercury and the low pressure are necessary)....
- 248
4
votes
Accepted
Diesel or Gasoline? Which one is more dangerous to our health?
1) In an engineering context efficiency has a very specific meaning ie it is the ratio between the energy you put into a system and the useful work that you get out. In itself this doesn't tell you ...
- 15.2k
4
votes
Accepted
How do you prevent ignition of the gas-air mixture before it reaches the burner nozzle?
Depending on fuel, a flame has a certain propagation speed - the speed with which the flame wanders through the medium. If the fuel - oxygen mixture moves faster through the pipe than the propagation ...
- 4,772
4
votes
Would pumping down (below 0 psi) on a gas cylinder regulator cause it to break?
I doubt there would be a problem. That type of gauge has a bourdon tube inside that has a curved flattened tube. The tube goes from flat to round as the pressure increases which straightens out the ...
- 1,000
3
votes
Accepted
Service Life of a Flashback Arrestor
The manufacturer says this about maintanence:
annual testing of the non-return valve, body leak tightness
and flow capacity is recommended
WITT is happy to supply special test equipment
...
- 4,772
3
votes
Accepted
Do pressurised cans still pose a risk to bursting in normal conditions, but after being exposed to heat?
Assume that high temperature causes no chemical reactions in the contents or between the contents and the can.
High temperature will increase the pressure in the can. Assume the can is fully ...
- 2,878
3
votes
Does the shape of a car really matter for how much gasoline it drinks?
The difference is in the drag coefficient.
Typical drag coefficient of the 50's cars have been in the range of 0.38 to 0.42 or so.
typical drag coefficient of modern cars even the ones not renowned ...
- 22.1k
3
votes
Gas kitchen stove in skyscrapers
Gas is odorized ( mercaptans ) which can be detected at a ppb level. The great majority of people notice the smell and take some corrective action. On the otherhand ,whenever you make something fool ...
- 6,112
3
votes
Accepted
If you shut down a gas pipeline for a few months would you fill it with gas at full pressure?
The blog is wrong . It requires higher pressures and/or lower temperatures to make hydrates. Hydrates can be a problem at high pressure gas production wells; such as above 5000 psi. That high ...
- 6,112
2
votes
Calculate pneumatic cylinder dimensions from work done
It is possible to calculate this under the assumption that all of the energy from the expansion goes into mechanical energy instead of being lost to heat transfer through the walls. In this case the ...
- 6,386
2
votes
Pressure drop across column in gas phase: what changes?
Frictional Heat!
In simple terms, the pressure drop that is observed is a result of the friction between the moving fluid, and the stationary walls and column packing.
This friction reduces the ...
- 533
2
votes
Working out pressure drop from leak rate
The rate of gas leakage depends on the pressure difference, and in your setup it looks like the pressure difference is constantly decreasing as the test is running. This means that the leak rate ...
- 3,044
2
votes
Is an Explosion Proof Circuit Breaker Panel Required at a Gas Station?
I see nothing in your picture to indicate that the circuit breakers need to be explosion proof. They don't appear to be in a zone 0 location, nor would I expect that any explosion proof volume would ...
- 11.4k
2
votes
Accepted
Understanding Permeation Units
$$
\frac{\left(\mbox{amount of gas}\right)\left(\mbox{thickness of membrane}\right)}
{\left(\mbox{membrane area}\right)\left(\mbox{time}\right)\left(\mbox{differential pressure of gas}\right)}
$$
...
- 7,904
2
votes
Is steel air (argon) tight?
Just adding on to Mr.Johns's answer, do try to make your threaded fittings according to NPT (National Pipe Thread) or BSPT (British Standard Pipe Taper). Both have a tapered profile which will ...
- 95
2
votes
How do you prevent ignition of the gas-air mixture before it reaches the burner nozzle?
No fuel (in the conventional sense) will burn without being mixed with oxygen. However it is entirely possible for air to get mixed with fuel in unexpected ways, especially if you have leaks in the ...
- 15.2k
2
votes
Natural gas mass flow conversion
You can probably assume the natural gas is an ideal gas, then apply the corresponding equation of state on any arbitrary control volume of the flow:
$$
pV=mRT
$$
where $p$ is pressure, $V$ is volume,...
- 3,044
2
votes
Diesel or Gasoline? Which one is more dangerous to our health?
My understanding:
Petrol engines produce far more carbon monoxide. Carbon monoxide is a colourless, odourless and highly toxic gas. This makes running petrol engines indoors far more dangerous than ...
- 189
2
votes
Can using different types of alcohol in a cloud chamber produce different particle tracks?
The only major difference the alcohol choice will make is the ionization energy. While the ionization energy for Methanol is 10.85 (source), ethanol is 10.62 eV, while Isopropyl is only 10.10 eV. ...
- 5,343
2
votes
Natural gas boiler Vs. Electric Heater efficiency
I answered a similar question on SE Sustainable Living recently.
Before anyone (including yourself) can answer your question you need to supply some more information.
The first thing you need to ...
- 9,642
2
votes
Determining gas properties in a steam and air gas mixture
Considering that air and steam behave as ideal gases, you can write the following equations:
$$ P V = nRT $$
$$ P_A V = n_A RT$$
$$ P_W V = n_W RT $$
where I use subscripts $_A$ and $_W$ for air and ...
- 335
2
votes
Accepted
Is there any option other than a gas welder
Brazing is generally a good way to repair cast iron but it tends not to be very easy to fill large gaps. You certainly can braze with a sufficiently powerful venturi burner using propane only but if ...
- 15.2k
2
votes
why doesn't soda go flat immediately after opening?
dissolved CO2 in water remains in solution even after removal of pressure because of the absence of nucleation sites at which the gas can come out of solution. without a population of those seed sites,...
- 14.3k
2
votes
Will natural gas or propane generators also run off of methane?
natural gas is methane, so no problems there. an internal combustion engine that is equipped to operate on gasoline can be converted easily to run on gaseous fuels and the conversion kits usually ...
- 14.3k
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